<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>
<form action="/pay" method="post">
    <input type="text" name="amount" placeholder="支付金额">
    <select name="payType" id="">
        <option value="huabei">支付宝花呗</option>
        <option value="baitiao">京东白条</option>
        <option value="creditCard">信用卡</option>
    </select>
    <input type="text" name="stagesCount" placeholder="分期数">
    <button type="submit">支付</button>
</form>

</body>
</html>